The Effect of Hydrophobically Modified Iron Catalysts with Hexadecyltrimethoxysilane on Fischer‐Tropsch Synthesis

Abstract

Hydrophobic modification of Fischer-Tropsch synthesis catalyst can inhibits water gas shift(WGS) reaction and regulates product distribution. Herein, a series of hydrophobic Fe 2 O 3 @SiO 2 -xHDTMS (Hexadecyltrimethoxysilane, HDTMS. x represents the amount of HDTMS.) catalysts with various HDTMS content were synthesized for Fischer-Tropsch synthesis to light hydrocarbons. The Fe 2 O 3 @SiO 2 -xHDTMS catalysts were characterized by X-ray diffractometer(XRD), scanning electron microscope(SEM), transmission electron microscope(TEM), fourier transform infrared spectrometer(FT-IR) and contact angle measuring instrument(CAMI). After HDTMS modification, the hydrophobicity of the catalyst is significantly improved, the selectivity of the catalyst to CO 2 is significantly reduced due to the inhibition of WGS reaction, and the selectivity of hydrocarbon products is significantly improved. This indicates that HDTMS is very suitable as a silanizer for hydrophobic modification of Fischer-Tropsch synthesis catalysts. With the increase of HDTMS content, the hydrophobicity of the catalyst always increased, but the selectivity of CO 2 in Fischer-Tropsch synthesis products decreased first and then increased, and the selectivity of hydrocarbons increased first and then decreased, indicating that the content of HDTMS has a significant impact on the hydrophobicity and catalytic performance of the catalyst.